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/*  $OpenBSD: screen.c,v 1.13 2006/04/20 03:25:36 ray Exp $ */

/*  $NetBSD: screen.c,v 1.4 1995/04/29 01:11:36 mycroft Exp $   */

/*-

 * Copyright (c) 1992, 1993

 *  The Regents of the University of California.  All rights reserved.

 *

 * This code is derived from software contributed to Berkeley by

 * Chris Torek and Darren F. Provine.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *  @(#)screen.c    8.1 (Berkeley) 5/31/93

 */

/** @addtogroup tetris

 * @{

 */

/** @file

 */

/*

 * Tetris screen control.

 */

#include <err.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <io/stream.h>

#include <async.h>

#include "screen.h"

#include "tetris.h"

#include <ipc/console.h>

static cell curscreen[B_SIZE];  /* 1 => standout (or otherwise marked) */

static int curscore;

static int isset;       /* true => terminal is in game mode */

/*

 * putstr() is for unpadded strings (either as in termcap(5) or

 * simply literal strings);

 */

static inline void putstr(char *s)

{

    while (*s)

        putchar(*(s++));

}

static int con_phone;

static void set_style(int fgcolor, int bgcolor)

{

    async_msg_2(con_phone, CONSOLE_SET_STYLE, fgcolor, bgcolor);

}

static void start_standout(void)

{

    set_style(0xf0f0f0, 0);

}

static void resume_normal(void)

{

    set_style(0, 0xf0f0f0);

}

void clear_screen(void)

{

    async_msg_0(con_phone, CONSOLE_CLEAR);

    moveto(0, 0);

}

/*

 * Clear the screen, forgetting the current contents in the process.

 */

void

scr_clear(void)

{

    resume_normal();

    async_msg_0(con_phone, CONSOLE_CLEAR);

    curscore = -1;

    memset((char *)curscreen, 0, sizeof(curscreen));

}

/*

 * Set up screen

 */

void

scr_init(void)

{

    con_phone = get_cons_phone();

    async_msg_1(con_phone, CONSOLE_CURSOR_VISIBILITY, 0);

    resume_normal();

    scr_clear();

}

void moveto(int r, int c)

{

    async_msg_2(con_phone, CONSOLE_GOTO, r, c);

}

static void fflush(void)

{

    async_msg_0(con_phone, CONSOLE_FLUSH);

}

winsize_t winsize;

static int get_display_size(winsize_t *ws)

{

    return async_req_0_2(con_phone, CONSOLE_GETSIZE, &ws->ws_row,

        &ws->ws_col);

}

/*

 * Set up screen mode.

 */

void

scr_set(void)

{

    winsize_t ws;

    Rows = 0, Cols = 0;

    if (get_display_size(&ws) == 0) {

        Rows = ws.ws_row;

        Cols = ws.ws_col;

    }

    if (Rows < MINROWS || Cols < MINCOLS) {

        char smallscr[55];

        snprintf(smallscr, sizeof(smallscr),

            "the screen is too small (must be at least %dx%d)",

            MINROWS, MINCOLS);

        stop(smallscr);

    }

    isset = 1;

    scr_clear();

}

/*

 * End screen mode.

 */

void

scr_end(void)

{

}

void

stop(char *why)

{

    if (isset)

        scr_end();

    errx(1, "aborting: %s", why);

}

/*

 * Update the screen.

 */

void

scr_update(void)

{

    cell *bp, *sp;

    cell so, cur_so = 0;

    int i, ccol, j;

    static const struct shape *lastshape;

    /* always leave cursor after last displayed point */

    curscreen[D_LAST * B_COLS - 1] = -1;

    if (score != curscore) {

        moveto(0, 0);

        printf("Score: %d", score);

        curscore = score;

    }

    /* draw preview of next pattern */

    if (showpreview && (nextshape != lastshape)) {

        int i;

        static int r=5, c=2;

        int tr, tc, t;

        lastshape = nextshape;

        /* clean */

        resume_normal();

        moveto(r-1, c-1); putstr("          ");

        moveto(r,   c-1); putstr("          ");

        moveto(r+1, c-1); putstr("          ");

        moveto(r+2, c-1); putstr("          ");

        moveto(r-3, c-2);

        putstr("Next shape:");

        /* draw */

        start_standout();

        moveto(r, 2 * c);

        putstr("  ");

        for (i = 0; i < 3; i++) {

            t = c + r * B_COLS;

            t += nextshape->off[i];

            tr = t / B_COLS;

            tc = t % B_COLS;

            moveto(tr, 2*tc);

            putstr("  ");

        }

        resume_normal();

    }

    bp = &board[D_FIRST * B_COLS];

    sp = &curscreen[D_FIRST * B_COLS];

    for (j = D_FIRST; j < D_LAST; j++) {

        ccol = -1;

        for (i = 0; i < B_COLS; bp++, sp++, i++) {

            if (*sp == (so = *bp))

                continue;

            *sp = so;

            if (i != ccol) {

                if (cur_so) {

                    resume_normal();

                    cur_so = 0;

                }

                moveto(RTOD(j), CTOD(i));

            }

            if (so != cur_so) {

                if (so)

                    start_standout();

                else

                    resume_normal();

                cur_so = so;

            }

            putstr("  ");

            ccol = i + 1;

            /*

             * Look ahead a bit, to avoid extra motion if

             * we will be redrawing the cell after the next.

             * Motion probably takes four or more characters,

             * so we save even if we rewrite two cells

             * `unnecessarily'.  Skip it all, though, if

             * the next cell is a different color.

             */

#define STOP (B_COLS - 3)

            if (i > STOP || sp[1] != bp[1] || so != bp[1])

                continue;

            if (sp[2] != bp[2])

                sp[1] = -1;

            else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {

                sp[2] = -1;

                sp[1] = -1;

            }

        }

    }

    if (cur_so)

        resume_normal();

    fflush();

}

/*

 * Write a message (set!=0), or clear the same message (set==0).

 * (We need its length in case we have to overwrite with blanks.)

 */

void

scr_msg(char *s, int set)

{

    int l = strlen(s);

    moveto(Rows - 2, ((Cols - l) >> 1) - 1);

    if (set)

        putstr(s);

    else

        while (--l >= 0)

            (void) putchar(' ');

}

/** @}

 */